dr. james irons has worked that program for decades. capturing forest fires or rivers suddenly swelling into floods. there's also human change as earth's population moves into cities. >> we watched cities all over the world expand. images are zooming in to help the chesapeake bay. >> when rain hits like it did thursday in baltimore it washes pollutants into water ways leading into the bay. they use imagines to track the growth of development to find ways to slow that run off from roads and parking lots. >> instead of being absorbed by the soil before it reaches the bay. alex demetrick, wjz news. >> lanset will continue with the launch of the eighth satellite next year. >> and there's one satellite dedicated for bob's properties. >> growing and growing and growing. >> i was waving at the satellite. let's take a look at radar. we have a little bit of rain. not much flood watch has been discontinued as of 9:00 tonight. not dealing with any heavy rain. just a few light sprinkles and showers. to the west of us a few pockets we will see some